メタデータ
| 項目 |
値 |
| Designation |
C/1987 B2 (Terasako) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-12-24T21:01:50.280960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-02-07.0000000 |
| e |
0.99522002 |
| q (au) |
0.392887 |
| a (au) |
82.194165 |
| i (deg) |
40.856893 |
| Ω (om, deg) |
97.699267 |
| ω (w, deg) |
195.270339 |
| M (ma, deg) |
0.058360 |
等級
散乱 + 全体線形
$$
M_a = (6.591 + 3.938\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.591 |
| n |
3.938 |
| gf |
0.984 |
| gb |
-1.000 |
| k |
0.962 |
| δ90 |
9.882 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:57:11.74 |
+27:58:49.8 |
HIP 33364 |
28.83 |
| 2026-03-26 12:00 |
06:57:11.42 |
+27:58:47.8 |
HIP 33364 |
28.83 |
| 2026-03-27 00:00 |
06:57:11.13 |
+27:58:45.7 |
HIP 33364 |
28.84 |
| 2026-03-27 12:00 |
06:57:10.85 |
+27:58:43.7 |
HIP 33364 |
28.85 |
| 2026-03-28 00:00 |
06:57:10.59 |
+27:58:41.6 |
HIP 33364 |
28.86 |
| 2026-03-28 12:00 |
06:57:10.35 |
+27:58:39.5 |
HIP 33364 |
28.87 |
| 2026-03-29 00:00 |
06:57:10.13 |
+27:58:37.3 |
HIP 33364 |
28.88 |
| 2026-03-29 12:00 |
06:57:09.93 |
+27:58:35.1 |
HIP 33364 |
28.90 |
| 2026-03-30 00:00 |
06:57:09.75 |
+27:58:32.9 |
HIP 33364 |
28.92 |
| 2026-03-30 12:00 |
06:57:09.59 |
+27:58:30.7 |
HIP 33364 |
28.94 |
| 2026-03-31 00:00 |
06:57:09.45 |
+27:58:28.5 |
HIP 33364 |
28.96 |
| 2026-03-31 12:00 |
06:57:09.33 |
+27:58:26.2 |
HIP 33364 |
28.99 |
| 2026-04-01 00:00 |
06:57:09.23 |
+27:58:23.9 |
HIP 33364 |
29.02 |
| 2026-04-01 12:00 |
06:57:09.15 |
+27:58:21.6 |
HIP 33364 |
29.05 |
| 2026-04-02 00:00 |
06:57:09.08 |
+27:58:19.2 |
HIP 33364 |
29.08 |
| 2026-04-02 12:00 |
06:57:09.04 |
+27:58:16.8 |
HIP 33364 |
29.11 |
| 2026-04-03 00:00 |
06:57:09.02 |
+27:58:14.4 |
HIP 33364 |
29.15 |
| 2026-04-03 12:00 |
06:57:09.01 |
+27:58:12.0 |
HIP 33364 |
29.18 |
| 2026-04-04 00:00 |
06:57:09.03 |
+27:58:09.5 |
HIP 33364 |
29.22 |
| 2026-04-04 12:00 |
06:57:09.06 |
+27:58:07.1 |
HIP 33364 |
29.26 |
| 2026-04-05 00:00 |
06:57:09.12 |
+27:58:04.6 |
HIP 33364 |
29.31 |
| 2026-04-05 12:00 |
06:57:09.19 |
+27:58:02.0 |
HIP 33364 |
29.35 |
| 2026-04-06 00:00 |
06:57:09.28 |
+27:57:59.5 |
HIP 33364 |
29.40 |
| 2026-04-06 12:00 |
06:57:09.40 |
+27:57:56.9 |
HIP 33364 |
29.45 |
| 2026-04-07 00:00 |
06:57:09.53 |
+27:57:54.3 |
HIP 33364 |
29.50 |
| 2026-04-07 12:00 |
06:57:09.68 |
+27:57:51.7 |
HIP 33364 |
29.55 |
| 2026-04-08 00:00 |
06:57:09.85 |
+27:57:49.1 |
HIP 33364 |
29.61 |
| 2026-04-08 12:00 |
06:57:10.04 |
+27:57:46.4 |
HIP 33364 |
29.66 |
| 2026-04-09 00:00 |
06:57:10.25 |
+27:57:43.7 |
HIP 33364 |
29.72 |
| 2026-04-09 12:00 |
06:57:10.47 |
+27:57:41.0 |
HIP 33364 |
29.78 |
| 2026-04-10 00:00 |
06:57:10.72 |
+27:57:38.3 |
HIP 33364 |
29.84 |
| 2026-04-10 12:00 |
06:57:10.99 |
+27:57:35.6 |
HIP 33364 |
29.91 |
| 2026-04-11 00:00 |
06:57:11.27 |
+27:57:32.8 |
HIP 33364 |
29.97 |
| 2026-04-11 12:00 |
06:57:11.58 |
+27:57:30.0 |
HIP 33364 |
30.04 |
| 2026-04-12 00:00 |
06:57:11.90 |
+27:57:27.2 |
HIP 33364 |
30.11 |
| 2026-04-12 12:00 |
06:57:12.25 |
+27:57:24.3 |
HIP 33364 |
30.19 |
| 2026-04-13 00:00 |
06:57:12.61 |
+27:57:21.5 |
HIP 33364 |
30.26 |
| 2026-04-13 12:00 |
06:57:12.99 |
+27:57:18.6 |
HIP 33364 |
30.34 |
| 2026-04-14 00:00 |
06:57:13.39 |
+27:57:15.7 |
HIP 33364 |
30.41 |
| 2026-04-14 12:00 |
06:57:13.81 |
+27:57:12.8 |
HIP 33364 |
30.49 |
| 2026-04-15 00:00 |
06:57:14.25 |
+27:57:09.9 |
HIP 33364 |
30.58 |
| 2026-04-15 12:00 |
06:57:14.70 |
+27:57:06.9 |
HIP 33364 |
30.66 |
| 2026-04-16 00:00 |
06:57:15.18 |
+27:57:03.9 |
HIP 33364 |
30.75 |